BambuLab A1 external spool wall mount

Does 3kg of weight swinging on the frame top of your A1 shake the table? Wall mounts I've found seem a little weak, and involve a 90dg rotation of the external guide arm project down or horizontal, thus making the spool drag against the PTFE input. Simple solution is to cut the tongue modeled on the A1 top bar into two with a missing width associated with the thickness of a generic flat shelf bracket. Bracket must be no wider than 1.57mm and less than ~½ the thickness of the tongue. My example was 5.5mm thick.